作者
Yuqing Sun, Cheng Lei, Eakalak Khan, Season S Chen, Daniel CW Tsang, Yong Sik Ok, Daohui Lin, Yujie Feng, Xiang-dong Li
发表日期
2017/6/1
期刊
Chemosphere
卷号
176
页码范围
315-323
出版商
Pergamon
简介
Nanoscale zero-valent iron (nZVI) was tested for the removal of Cu(II), Zn(II), Cr(VI), and As(V) in model saline wastewaters from hydraulic fracturing. Increasing ionic strength (I) from 0.35 to 4.10 M (Day-1 to Day-90 wastewaters) increased Cu(II) removal (25.4–80.0%), inhibited Zn(II) removal (58.7–42.9%), slightly increased and then reduced Cr(VI) removal (65.7–44.1%), and almost unaffected As(V) removal (66.7–75.1%) by 8-h reaction with nZVI at 1–2 g L−1. The removal kinetics conformed to pseudo-second-order model, and increasing I decreased the surface area-normalized rate coefficient (ksa) of Cu(II) and Cr(VI), probably because agglomeration of nZVI in saline wastewaters restricted diffusion of metal(loid)s to active surface sites. Increasing I induced severe Fe dissolution from 0.37 to 0.77% in DIW to 4.87–13.0% in Day-90 wastewater; and Fe dissolution showed a significant positive correlation with Cu …
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Y Sun, C Lei, E Khan, SS Chen, DCW Tsang, YS Ok… - Chemosphere, 2017